5.3

CVE-2026-49299: openstack neutron Incorrect Authorization

CVSS: 5.3v4.0MediumDeferred
AliasesGHSA-xv24-hxh9-2hh9PYSEC-2026-2678UBUNTU-CVE-2026-49299
Published 28-05-2026Last modified 02-06-2026
Open JSON

Vulnerability summary

CVE-2026-49299 is a medium (CVSS 5.3) Incorrect Authorization vulnerability in openstack neutron. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 35.6% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.43%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 28-05-2026
    PublishedVulnerability first disclosed.
  2. 02-06-2026
    Last modifiedVulnerability information updated.

Description

In OpenStack Neutron before 28.0.1, the tagging controller enforces plural policy action names on single-tag write operations while the defined policy rules use singular names. The mismatched names evaluate as allowed under the default policy, permitting a project reader to create and update tags on same-project resources. Deployments running Neutron 26.0.0 or later are affected.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

+0.13 pp

From 0.29% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.43%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • neutronAll versions (No fix recorded) | < 2:26.0.0-9+deb13u1 | < 2:28.0.0-4
Openstack1 product
  • neutron≥ 26.0.0, < 26.0.4 | ≥ 27.0.0, < 27.0.3 | ≥ 28.0.0, < 28.0.1
PyPI1 product
  • neutron≥ 27.0.0, < 27.0.3 | ≥ 26.0.0, < 26.0.4 | ≥ 28.0.0, < 28.0.1
Ubuntu1 product
  • neutronAll versions (No fix recorded)

4 vendors · 4 products

References

12 links
Show all 12 references